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Arakawa Group (Kawada, 1948) Sakai, 1986

• Coherent formation
• middle - late Miocene

• Sedimentary facies: Marine

• Lower limit: Unconformity (Nakagawa Group)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Nasukarasuyama city - Nakagawa city, Nasu county - Ichikai city, Haga county, Tochigi pref.

• Matsui et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.89-102 DOI
• Hayashi et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.3, pp.141-144 DOI